Williams C S, Eastoe B V, Slaiding I R, Walker M D
BRF International, Redhill, Surrey, UK.
Food Addit Contam. 1994 Sep-Oct;11(5):615-9. doi: 10.1080/02652039409374261.
A method has been developed for analysing pesticide residues in whole hops, hop pellets and hop extracts by GC-MS. Five batches of hop pellets containing nine different pesticides (triadimefon, dicofol, mephosfolan, bupirimate, cyhalothrin, tetradifon, endosulfan, pyrazophos and total bisdithiocarbamates) were extracted with liquid CO2. Pesticide concentrations in the original hop pellets and the extracts were determined. The pesticides were concentrated by the extraction process (concentration factor 1.3-8.3), except for the bisdithiocarbamates, which were not extracted. When the same amount of bitterness was added into the brewing process using liquid CO2 extract as opposed to hop pellets, for most of the pesticides proportionately less pesticide was added. However, for two pesticides (dicofol and triadimefon) corrected residue levels were similar to, or in some cases slightly higher than, those in hop pellets.
已开发出一种通过气相色谱 - 质谱联用（GC-MS）分析全啤酒花、啤酒花颗粒和啤酒花提取物中农药残留的方法。用液态二氧化碳萃取了五批含有九种不同农药（三唑酮、三氯杀螨醇、地虫磷、乙嘧酚磺酸酯、氯氟氰菊酯、四螨嗪、硫丹、吡唑硫磷和总二硫代氨基甲酸盐）的啤酒花颗粒。测定了原始啤酒花颗粒和提取物中的农药浓度。除未被萃取的二硫代氨基甲酸盐外，其他农药通过萃取过程得以浓缩（浓缩系数为1.3 - 8.3）。与使用啤酒花颗粒相比，当在酿造过程中使用液态二氧化碳提取物添加相同量的苦味物质时，对于大多数农药而言，添加的农药量成比例减少。然而，对于两种农药（三氯杀螨醇和三唑酮），校正后的残留水平与啤酒花颗粒中的残留水平相似，在某些情况下甚至略高于啤酒花颗粒中的残留水平。
